Don't muddy the waters? That is the topic of the thread!

If you read the book rather than just *****, whine and dismiss, you'll understand that the model has the best underlying data to go by, our own civilization and our own planet. If we want to understand how another planet LIKE EARTH might fare with another civilization LIKE US, with the variable being how we address the issues of resource utilization and population growth, I can't think of a better place to start.
UNDOUBTEDLY, unchecked, humanity faces a major crisis within the next 100 years that will decide our long term survival.
demographers have an actual track history of being good predictors of population, and population trends. Climatologists have an exceptionally poor record of predictions. So bad that well known charlatan sylvia browne, of psychic fame, had a better record. Far better in point of fact. Demographers actually use real numbers. Numbers that have been VERIFIED. Climatologists don't.
The models that the climatologists use ignore vast amounts of real data to support their theories. They always have. They have also ignored vast amounts of real historical fact, that is readily available, because the historical fact refutes their pet theories. They claim that warmth is bad. Historical fact tells us that that belief is false. All of the great periods of mans history, his development of culture, and science, and philosophy, have ALL come when the world was warmer than it is now. Every single one of mans major advances has happened when he was able to bask in the warmth of a warmer planet. This is simple historical fact that the climatologists have tried to hide.
Yes, yes, yes, I know all that. But how do you know that the demographics, real numbers, real historical fact, et al, are not all part of the predictive model being relied upon in this man's book? His model is about US, people, civilization as much as it is about the planet. As to warmer periods being times of greatest cultural advancement, no one knows that better than me, it is a part of the historical record.
Man's entire modern civilization has been built upon the warming that followed the Younger Dryas cooling, and especially since the last 5,000 years, beginning with Sumeria, the Iron Age, the Roman Republic, the Greeks, right into the Medieval Warm Period and the Renaissance, Common Law, the Ottoman Empire, and the great enlightenment beginning in the 18th century. Ironically, some of our worst events such as the Black Death, the Great Famine, and the Plague all centered around the Little Ice Age between the 14th and 17th centuries! In all cases, both plants and animals flourish better in a warmer climate than they do a cooler one.